diff --git a/lib/Makefile b/lib/Makefile
index b2b0aa046..1f7cf906b 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -117,7 +117,7 @@ else
 ENABLE_EPOLL=-DENABLE_EPOLL
 endif
 
-MYCFLAGS=$(IDIRS) $(OPTZ) $(DEBUG) -Wall -DGITVERSION=\"$(GIT_VERSION)\" $(NOJEM) $(WGCOV) $(WASAN)
+MYCFLAGS=-std=c11 $(IDIRS) $(OPTZ) $(DEBUG) -Wall -DGITVERSION=\"$(GIT_VERSION)\" $(NOJEM) $(WGCOV) $(WASAN)
 MYCXXFLAGS=-std=c++11 $(MYCFLAGS) $(PSQLCH) $(ENABLE_EPOLL)
 
 default: libproxysql.a